Ok guys, I have seen so many posts on this issue that I wanted to make a new thread on all the steps I took to get this working for me.
First off I am using a jailbroken iPhone 3g on an AT&T family plan. My plan when starting consisted of the iPhone text messaging 200 feature and of course unlimited data.
First off I downloaded the Swirly MMS app from Cydia (still using the trial version) and inputted the common settings for AT&T:
Code:
MMSC: mmsc.cingular.com
proxy: 66.209.11.032
No apn, username/password
image size: medium
user agent: Nokia_N95(I've had success with iPhone as well)
Next I used the online chat support to get them to send an OTA network reset to my phone. This was easy to do. I just told them "I was having data/internet issues and called a customer service rep to get it fixed. Since I was using my iPhone already to make the phone call, she instructed me to contact a rep via online chat so they can send the OTA and guide me through the process." They did it instantly.
At this point MMS still did not work
Next I realized that the iPhone text messaging 200 plan was restricting me from sending/recieving MMS messages. The easiest way for me to solve this was to call them up (couldn't do it online) and ask to have the $30 unlimited messaging for families added to my plan. This was actually a good thing for me because we have 4 family members paying $5 for 200 text messages and then paying some overage charges. If you do not wish to add this package you will need to contact customer service and somehow convince them to add a regular messaging plan to your account. It is important to know that MMS will NOT work if you have any messaging plan that says iPhone in the feature title.
Usually if you are polite and have a somewhat valid excuse, customer service will be glad to help you!
Finally I waited a few minutes for the change to take hold and tested out Swirly MMS. Low and behold it worked! All it took was less than 20 minutes of my time.
I know there are many conflicting stories out there, and another member that is working really hard to try and get people help. This guide just shows you a way you can do it yourself without any help, or any payment required.
I will be glad to answer questions and give advice
-DMod